Hydrogen is an advanced drum machine for GNU/Linux. It's main goal is to bring professional yet simple and intuitive pattern-based drum programming.

Hydrogen for Linux Features:
General
1. Very user-friendly, modular, fast and intuitive graphical interface based on QT 3.
2. Sample-based stereo audio engine, with import of sound samples in .wav, .au and .aiff formats.
3. Support of samples in compressed FLAC file.

Sequencer and mixer
1. Pattern-based sequencer, with unlimited number of patterns and ability to chain patterns into a song.
2. Up to 64 ticks per pattern with individual level per event and variable pattern length.
3. 32 instrument tracks with volume, mute, solo, pan capabilities.
4. Multi layer support for instruments (up to 16 samples for each instrument).
5. Ability to import/export song files.
6. Unique human velocity, human time, pitch and swing functions.
7. Multiple patterns playing at once.

Other
1. JACK, ALSA, PortAudio and OSS audio drivers.
2. ALSA MIDI and PortMidi input with assignable midi-in channel (1..16, ALL).
3. Import/export of drumkits.
4. Export song to wav file.
5. Export song to midi file.

The license of this software is Free, you can free download and free use this audio utility software.